Combined fluid heater and baking- oven



Geo/ge Sayre/7a2 /N vfv To@ 5? @www ArroR/vsrs G. SURPRENANT GOMBNED FLUID HEATER AND BAKING OVEN Filed Dec. 19,

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Patented Nov. 22, 1932 UNiTi-:D STATES GEORG SURPREANT, OIF ROTTERDAM, NEW YORK y COMBINED FLUID 'HEATER AND BAK-rive OVEN j Application filed Decemberl, 1930. Serial No. 503,516.

My invention more particularly relates to a combined fluid heater and baking oven in which the hot gases contact both with` the heating surface and with the walls of the 5 oven. n

' Myinvention will best be understood by reference tothe accompanying drawing in which I, have illustrated a preferred embodiment of my invention and in which Fig. 1 is a 10 vertical sectionalu view through a liquid heater and-its furnace and a baking oven embodying my invention and Fig. 2 is a sectional plan view takenalong the .plane of the line 2-2 of Fig. 1. lt vis to be understood that l5 this showing is typ-icalA and I may use any suitable type'of liquid heater.

Like reference characters indicate like parts throughoutv the drawing.

Referring now yto the drawing, is a water space of the heater defined by side walls 11, end walls12, an upper tube sheet 13, which ris secured to the side and end walls in any Y desired manner as by rivets, 14, to vform a water tight joint. The water'space of the steam boiler thus Acontainsa single body of water above which a steam space is formed. VA lower tube sheet 15 is also secured in any desired manner to the side walls 11 and end .walls 12 to completetheenclosure. -Asuit- O 'able furnace `16 is disposed in the front end of the boiler, as best shown in Fig. 1, to form a furnace chamber, 17, to which a suitable Huid is admitted through a nozzle 18 through which it is forced by a blower 19 intol the side of thel furnace, as indicated ink Fig. 2, the

blower being actuated by a motor 191. This furnace kmay be of any suitable type. It could, for example, be built with a grateand usedfor solid fuel.. y

The gases ,from the furnace chamber 17 flow lupwardly through a group of tubes indicated generally at 2O and comprising a lower section 21'of comparatively short fire tubes which are expanded at their lower ends into the tube sheet which forms the top of the furnace 16 and at their upper ends into a tube sheet 22 forming the lower wall of a chamber 23. The group of tubes 2O also comprises an upper'section 21 of comparatively short fire 5otubes attached preferably by. ,expanding at lwith Ythe front 'wall or plate of the boiler their lower ends into the tuber sheet 25 forming the upper wall of the chamber 23 and at their upper ends expanded into the tubesheet 13. Side walls 26, an end wall 27, together complete the enclosure for the chamber 23.

In accordance with my invention a baking oven 28 is located within the chamber 23, `the ywalls thereof being spaced from the walls of the chamber and supported on suitable members, such as angle irons`29.y The oven, which may be substantially rectangular in cross section is received in an opening 291 in the front plate of the boiler and is readily Y removable therefrom. The walls of the oven may be riveted together as at 30, as indicated in Fig. 1, member 281, forming the upper surface thereof. r1`he front of the oven is provided with a'suitable access door 31, which effects a closure of substantially the entire front of said oven. f

The walls defining the chamber 23 therefore, are suspended from the upper tube sheet 13 by the tubesof the upper section 241. The furnace, in turn, is suspended from the lower `wall of the furnace chamber .23 by the fire tubes of the lower section 21.

- The lower wall 171 of the furnace is provided with an opening, 32, andthe lower sheet or plate 15l provided with an opening 33 registering with'the first mentioned opening, an annular member 3&1 being inserted through the two openings andwelded or otherwise secured both to the bottom plate or the lower wall171 of the furnace and to -85 the sheet or plate 15 to forni a water tight joint. The opening formed in the `annular member 34 is normally closed by a cover 35. if it is desired to use what is known as a spinner type of oil burner, the cover 35 is removed and the oil burner is mounted within the opening formed in the annular mem` ber 34 and in a vertical position, in which case the burner 18 would be removed and the opening in which it is located would be closed. 9 The fire tube boiler, in which l have chosen to illustrate my invention, also comprises a second group of tubes-36 secured at their upper ends in openings in the tube sheet 13 and at their lower ends in the plate or sheet 15.

The side walls 11 and the end walls 12 of the heater are preferably extended upwardly above the tube sheet 13 as at 37, and a cover plate 38 is preferably provided with an opening 39 which is adapted to receive a readily removable cover 40. Wvhen the covcr40 is removed, vthe opening through the top plate provides access to the upper ends of the upper section of the first group of tubes and to the tubes of the second group. y

A chamber 41 is provided beneath the second group of tubes 36 and is defined in part by suitable plates 42 secured to the underside of the sheet or plate 15 and a bot-toni plate 43 secured thereto and to the side and rear walls (in a manner not illustrated), and by a downward extension 44' of the rear end of the wall 12. A grate, 45, is preferably provided in the vlower portion of the chamber 41 for the reception of refuse which may be inserted through a door 46 and on which such refuse may be incinerated.

The lower end of a stack 47, secured in an opening in the tube sheet 15, preferably passes upwardly through the boiler, through an opening in the vtube sheet 13 and'tlirough yan opening in the cover plate 38 .in the maiinel illustrated in Fig. 1.

The inlets for the heater liquid are indicated at 48 and the outlets at 49. The front end of the furnace is supported by posts, one of which is indicated at 50 in Fig. 1.

The operation of the device embodying my invention will readily be understood from the foregoing description and is as follows:

The gases from the furnace 17 pass upwardly through the short re tubes of the lower section 21 of re tubes of the first group into the space between the walls of the chamber 23 and the baking oven 28. The gases flowing upwardly over the side walls and the rear end of thewallof the baking oven heat it to a temperature sufficiently high to carry out a desired baking operation in the oven. The gases then flow upwardly through Vthe upper section 24 of the first group of tubes into the space between the plate or sheet 13 and the cover 38. l Thence, the gases flow downwardly through the second group of `fire tubes 36 through the chamber 41, and

then upwardly through the stack 47.

It will be noted that the stack 4? is sub- 'jected Within the space between the sheet or plate 13'and the cover 38 to the action of the hot gases, and it is also surrounded by the liquid of the heater. I have found in practice that in starting the heater cold, the

eating of the section of the stack between the plate 13 and the top plate 3S creates a draft sufficient to draw the gases upwardly through the first group of fire tubes and then downwardly through the second group of fire tubes through space 41 into the stack. Furthermore, by surrounding the lower portion of the stack with heated water or other liqspace uid in the manner illustrated, the heating of the stack thus surrounded with the hot liquid further promotes suction in the stack and further assists in inducing a. flow of gases through the first and second sections of the lire tubes when the liquid in the heater has been heated.

While I have described my invention in itspreferred embodiment it is to be understood that the words which I have used are words of description rather than of limitation, and that changes within the purview of the appended claims may be made without departing from the truc scope and spirit of my invention in its broader aspects.

What I claim is :y f

1. In combination, a furnace, a fire tube liquid heater comprising two spaced sections of tubes through which the gases flow up- ,4

liquid heater comprising a first group of u fire tubes in which the gases from said fui'- nace flow upwardly7 a second group of fire tubes in which the gases flow downwardly, said first group of tubes being divided into two spaced sections, and a baking oven interposed between said two sections, whereby the hot gases flow upwardly in succession through the lower tubes of said section, over said oven, then through the upper tubes of said section, and finally downwardly through the tubes of said second group.

3. Incombination, a furnace, a fire tube liquid heater comprising a group of fire tubes divided into upper and lower spaced sections, tube sheets to which the tubes of the respective sections are connected, means comprising said tube sheets defining a chamber, and a bakin oven located in said chamber and from the walls thereof whereby the hot gases in flowing from the tubes of said first section to said second section contact with the walls of said baking oven.

4. In combination, ak furnace, a fire tube liquid heater comprising a group of lire tubes divided into upper and lower spaced sections through which the gases from the furnace i fiow upwardly, tube sheets to which the tubes of the respective sections are connected, means comprising said tube sheets defining a chamber, a baking oven located in said chamber ond group of fire tubes in which the gasesL from said first group flow downwardly.

5. In combination, a liquid heater of the lfire tube type, an upper tube sheet, an upper section of fire tubes secured in openings in said tube sheet, a chamber the upper wall of which is provided with Openings in which the lower ends of said tubes are secured, a furnace, and a lower section of ire tubes secured at their ends in the upper wall of said furnace and the lower wall of said chamber respectively, and a baking oven located in said chamber with the walls thereof spaced from the walls of said chamber whereby the gases flow upwardly from the furnace through thek lower section of fire tubes, thence over the walls of said oven,and through the upper section of fire tubes.

6. In combination, a furnace, a lire tube steam boiler comprising two spaced sections through which the gases flow upwardly, and

a baking oven interposed in the spa-ce be` tween two said sections and subjected to the action of said gases.

7 In combination, a furnace, a fire tube boiler comprising two spaced sections surrounded by a singlek body of water and through which sections the gases iiow upwardly, and a baking oven interposed in the space between two said sections of tubes-and subjected to the action of said gases.

GEORGE SURPRENANT. 

